[root@dlink-EA87CA ~]# df -h
Filesystem Size Used Available Use% Mounted on
%root% 8.7M 6.8M 1.5M 82% /
/dev/ram0 8.7M 6.8M 1.5M 82% /
mdev 249.1M 0 249.1M 0% /dev
/dev/loop0 39.3M 39.3M 0 100% /usr/local/modules
ubi0:config 4.8M 196.0K 4.3M 4% /usr/local/config
none 2.0M 364.0K 1.6M 18% /mydlink
/dev/sda4 959.9M 35.3M 924.6M 4% /mnt/HD_a4
/dev/sdb4 959.9M 34.2M 925.7M 4% /mnt/HD_b4
/dev/sda2 3.6T 3.2T 437.9G 88% /mnt/HD/HD_b2
/dev/sdb2 3.6T 3.3T 334.0G 91% /mnt/HD/HD_a2
[root@dlink-EA87CA ~]# mount -o bind /mnt/USB/USB1_c1
mount: can't find /mnt/USB/USB1_c1 in /etc/fstab or /etc/mtab
[root@dlink-EA87CA ~]# usb scan
-bash: usb: command not found
[root@dlink-EA87CA ~]# mount
%root% on / type unknown (rw)
proc on /proc type proc (rw)
/dev/ram0 on / type ext2 (rw)
sysfs on /sys type sysfs (defaults)
mdev on /dev type tmpfs (defaults)
proc on /proc type proc (0)
squash on /usr/local/tmp type ramfs (size=42m)
/dev/loop0 on /usr/local/modules type squashfs (loop)
ubi0:config on /usr/local/config type ubifs (0)
none on /mydlink type tmpfs (rw,size=2m)
/dev/sda4 on /mnt/HD_a4 type ext4 (rw)
/dev/sdb4 on /mnt/HD_b4 type ext4 (rw)
/dev/sda2 on /mnt/HD/HD_b2 type ext4 (rw,noatime,nodiratime,commit=30,data=write
/dev/sdb2 on /mnt/HD/HD_a2 type ext4 (rw,noatime,nodiratime,commit=30,data=write
none on /proc/bus/usb type usbfs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)
[root@dlink-EA87CA ~]# mount -t usbfs none /mnt
[root@dlink-EA87CA ~]# mount -t usbdevfs none /proc/bus/usb
mount: unknown filesystem type 'usbdevfs'
[root@dlink-EA87CA ~]#